CVE-2026-43008

Description

In the Linux kernel, the following vulnerability has been resolved: gpio: qixis-fpga: Fix error handling for devm_regmap_init_mmio() devm_regmap_init_mmio() returns an ERR_PTR() on failure, not NULL. The original code checked for NULL which would never trigger on error, potentially leading to an invalid pointer dereference. Use IS_ERR() and PTR_ERR() to properly handle the error case.

CVSS Details

CVSS Score

5.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* - VULNERABLE

Linux Kernel < Commit 8de4e0f44c638c66cdc5eeb4d5ab9acd61c31e4f

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

/*
 * Conceptual Proof of Concept for CVE-2026-43008
 * This snippet demonstrates the vulnerable logic.
 * Triggering the actual bug requires specific hardware/failure conditions.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

static int vulnerable_probe(struct platform_device *pdev)
{
    struct resource *res;
    void __iomem *base;
    struct regmap *map;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    base = devm_ioremap_resource(&pdev->dev, res);
    if (IS_ERR(base))
        return PTR_ERR(base);

    // Vulnerable call: Returns ERR_PTR on error, not NULL
    map = devm_regmap_init_mmio(&pdev->dev, base, &qixis_regmap_config);

    // BUG: The check assumes NULL on failure
    if (!map) {
        // In a real failure scenario (e.g. -EINVAL), this block is skipped
        dev_err(&pdev->dev, "Failed to init regmap\n");
        return -ENOMEM;
    }

    // If devm_regmap_init_mmio failed, 'map' holds an error address (e.g. 0xffff...)
    // Accessing it here causes a Kernel Panic/Oops
    regmap_write(map, 0x0, 0x1);

    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43008
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43008
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43008/
[4] VulDB https://vuldb.com/cve/CVE-2026-43008
[5] https://git.kernel.org/stable/c/8de4e0f44c638c66cdc5eeb4d5ab9acd61c31e4f
[6] https://git.kernel.org/stable/c/e54b8fe9454cc786590a0b88db96afe0cdc8a83d

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43008", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-01T15:16:44.670", "lastModified": "2026-05-07T20:24:50.790", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: qixis-fpga: Fix error handling for devm_regmap_init_mmio()\n\ndevm_regmap_init_mmio() returns an ERR_PTR() on failure, not NULL.\nThe original code checked for NULL which would never trigger on error,\npotentially leading to an invalid pointer dereference.\nUse IS_ERR() and PTR_ERR() to properly handle the error case."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.12", "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8de4e0f44c638c66cdc5eeb4d5ab9acd61c31e4f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e54b8fe9454cc786590a0b88db96afe0cdc8a83d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}